G2, then spray on, then Duplicolor
The Duplicolor kit is the worst of the bunch that I have used. G2 formed a nice hard finish that resisted brake fluid. The Duplicolor came right off at the slightest spill, and scratched really easily. I've seen rattle can paint jobs hold up better.
(And these were prepped properly. Dremeled smooth, degreased, and cleaned, on the bench)